Actually, the comic itself has more recently become more political and
has been accused of being racist/bigoted. If you haven't been reading the strip since its heyday in the 90s you'd probably be none the wiser.
For example, it introduced its first black character for the sole purpose of wading into identity politics: https://boingboing.net/2022/05/08/dilbert-creator-introduces...
Separating art from artist is something that is easier or more difficult to do depending on the artist.
For someone like O.J. Simpson, the separation is quite clear. His football career predated and had no relation to his alleged infractions in his personal life. Plus, there's no real way to financially support a retired player. Going to the Buffalo Bills game today or watching old highlight clips doesn't financially benefit O.J.
For someone like Woody Allen, it's hard to ignore that his art that he directs and writes happens to include some pretty gross plot-lines, like in one his most critically acclaimed movies Manhattan where his 42 year old character dates a 17 year old.
Another "fun" fact, Woody Allen hit on the actress who played Tracy and invited her to stay with him in his hotel room: https://en.wikipedia.org/wiki/Mariel_Hemingway#Personal_life
The fact that the general population was just sort of ignorant of how problematic this was doesn't really change the fact that Woody Allen is very obviously attracted to minors and that his actions were never okay.
So, really, for some of these people there is not much separation between art and the artist. Some are more of a blurred line. For example, arguably, the art of Harry Potter doesn't include much damning content, but many people have made connections between some details of the Wizarding World and the way the author's voice portrays them, and how problematic they might be in the context of her public opinions. I think this is why there's such a split on opinions on whether to continue to consume Harry Potter content amongst fans of her work.
For Scott Adams, it's clear to me that the artist is intruding on the art much more than J.K. Rowling ever intruded on her art. Adams has joined the right wing white nationalist cult and it leaks into the comic strips all the time. It's very much a political strip.
Let me finish off on the topic of "cancel culture." Let's say you walked into a candy store and the owner called you a shithead. You probably wouldn't buy candy from that candy store, right?
Well, Scott Adams did that to all Black people just now. You walk into his candy shop and you look a certain way, and he categorically dislikes you before you even say hello.
Scott Adams categorically called an entire group of people shitheads based on the color of their skin alone, not thinking twice about whether that group of people might be in charge of editorial decisions at newspapers or whether that group of people might be customers of his product.
The truth is, it's not very hard to treat everyone with respect and dignity regardless of their ethnicity or personal background. It's not hard to treat people the way you would like to be treated.
People like Scott Adams are actively going out of their way to hurt people's feelings, so they can't act like it's an injustice for their feelings and bank account to be hurt in return.
If boycotting assholes is cancel culture, long live cancel culture.